Industrial oil filter control unit



N. O. ROSAEN lNDUSTRIAL OIL FILTER CONTROL UNIT Jan. 6, 1970 2Sheets-Sheet 1 Original Filed July 21, 1958 NILS O. ROSAEN ATTORNEYSJan. 6, 1970 N. o. ROSAEN INDUSTRIAL OIL FILTER CONTROL UNIT 2Sheets-Sheet 2 Original Filed July 21, 1958 FIG.3.

PRESSURE FILTER INVENTOR.

NILS O.ROSAEN ATTORNEYS FIG.5.

United States Patent 26,752 INDUSTRIAL OIL FILTER CONTROL UNIT Nils 0.Rosaen, Hazel Park, Mich., assignor to The Rosaen Filter Company, HazelPark, Mich., a corporation of Michigan Original No. 2,936,731, dated May17, 1960, Set. N0. 749,952, July 21, 1958. Application for reissue Sept.21, 1966, Ser. No. 601,244

Int. Cl. Golf 15/00 U.S. Cl. 116-70 7 Claims Matter enclosed in heavybrackets appears in the original patent but forms no part of thisreissue specification; matter printed in italics indicates the additionsmade by reissue.

ABSTRACT OF THE DISCLOSURE A liquid filter control unit for maintainingcontinuous circulation of liquid under pressure. The unit being incommunication with means to filter the liquid and having means operableunder pressure to by-pass liquid when the filtering means is no longerefiectively filtering. The unit having indicator means to indicateliquid routing.

The present invention relates to an industrial oil filter and morespecifically to a filter provided with means to provide information asto filter condition.

In many machine installations, means is provided for circulating oil inconsiderable volume over parts of the machine, work being done or forother reasons, and in order to insure a sup-ply of substantially cleanoil, filtration is imperative.

However, the filters used for this purpose eventually become clogged sothat the oil will not pass or will pass too slowly to be practicable.

Among the objects of the present invention is to provide means whichwill indicate to an observer the condition of the filter; that is,whether it is clean, partially clogged but still operating, or tooclogged to pass the fluid.

Other objects will readily occur to those skilled in the art uponreference to the following description and the accompanying drawings inwhich FIGURE 1 is a side elevational view, indicating a submergedsuction filter.

FIGURE 2 is a central horizontal sectional view of the structure ofFIGURE 1.

FIGURE 3 is a central sectional view on a vertical plane, of thestructure of FIGURE 1.

FIGURE 4 is a top plan view of a portion of the control unit.

FIGURE 5 is a more or less diagrammatic view showing the adaptation to apressure filter.

As indicated in the drawings, the invention relates primarily to afilter which is normally submerged in a tank holding a body of oil fromwhich it is pumped to the point of use and to which it is then returned.Such a tank is indicated by the wall 10. The filter itself is indicatedat 11 and will consist usually of a screen formed into a cylinder with aclosure for one end and the other end opening to the fitting shown indetail.

The fitting as shown comprises a body 14 having an inlet 12 to which thefilter 11 is fixed and into which oil flows from the filter. The body 14also is shown as having two outlets 15 either or both of which may beused, a suction pump being connected thereto.

As shown best in FIG. 3, the body 14 is provided with a large centralbore 16 open to the bottom of the fitting and terminating near the topin a dome shaped portion 16A somewhat smaller in diameter. The bore 16is open Reissued Jan. 6, 1970 to the inlet 12 and the outlets 15 eitherof which may be utilized, the other being plugged. In the lower portionof bore 16 is fitted a piston 20 this being in the form of a ring havinga relatively large central opening 21. The piston 20 is also shown asreduced in diameter in its upper portion above the gasketed portionfitting the bore.

The central opening 21 is also shown as flared at the bottom as at 21Aand provided at its upper end with a shoulder or recess 21B serving as aseat for a spring 22.

Also in the bore 16 is a valve member and piston guide 25. This consistsof a [bore] core 26, preferably cylindrical, of much smaller diameterthan the central opening 21 in piston 20, which core is provided withlongitudinal ribs 27, four being shown, and with a disc 28 havingsubstantially the same diameter as that of the opening 21. However, itshould be enough smaller to provide for a sliding fit. Disc 28 islocated within the upper end of the opening 21 when the piston 20 is atits lowest position.

The outer edges of ribs 27 are machined parallel and to fit the opening21 for the greater portion of their length, but at their upper portionsincline outwardly and the core cut away so that free oil how to theupper outlet 15 is permitted. The upper ends of the ribs 27 are formedto abut the dome shaped portion 16A of the bore 16. The inclinedportions of the ribs 27 are also notched as at 27A to provide a seat forthe upper end of spring 22.

The piston 20, [member] piston guide 25 and spring 22 are inserted as aunit into the bore 16 and retained therein by means of a snap ring 30seated in a suitable groove near the bottom or open end of the bore,while the said open end is covered by a screen 31 held in place by asuitable ring 32.

In FIGS. 1 and 2 is shown the indicator [tell-tale] which serves toindicate the condition of the filter [screen] 11. At one side of thebody 14, a large boss 35 is provided extending outward to a locationwell beyond the [screen element] filter 11 so that the outer end may beplaced against the tank wall 10, which at this location is provided witha suitable window 10A.

Rotatably mounted in the boss 35 and extending into the bore 16 is ashaft 36 having fixed to its inner end an arm 37 having its endcontacting the piston 20 so that movement of the latter will rotate theshaft 36. On the outer end of shaft 36 is fixed an arm or pointer 38,cooperating with a suitable legend 39 to indicate from the position ofthe pointer with respect thereto, and thereby the position of thepiston, whether the filter is clean, needs cleaning, or is bypassingoil.

In the operation of the device, the unit together with the filter willbe submerged in the tank of oil. Either or both outlets 15 will beconnected to a suitable circulating suction pump. If one outlet 15 is tobe used, the other will of course be plugged.

As the filter 11 becomes clogged, the reduced pressure in the filter andindicating member will cause the piston 20 to rise against the springpressure and thereby move the indicator hand 38. When the piston 20 hasrisen sufficiently far to bring the flare or bevel 21A above the disc28, oil will of course enter through screen 31 and thus bypass thefilter 11. The indicator 38 will then be at its uppermost position toindicate such bypassing.

In FIGURE 5 the use of the fitting for control of a pressure filter isshown. In this figure, a pressure filter is indicated at 40, oil beingcirculated therethrough by a suitable pump 41. From the filter the oilpasses to the fitting 114 and thence to the place of use (not shown).

The fitting 114 may be identical with that shown in FIGS. 1 to 4 withthe exception that the screen 31 is replaced by a cap 42, openingthrough which is a conduit 43 leading from the fluid line ahead of thefilter; that is, between the pump 41 and the filter 40. In thisinstallation, the filter and fitting may or may not be submerged in theoil tank.

In the arrangement of FIG. 5, the operation of the device is the same asabove and the piston is actuated by the difference in pressure above andbelow it. In the above description the pressure below the piston will beatmospheric (open tank) or whatever pressure there may be in a closedtank.

In the operation of the arrangement of FIGURE 5, the pressure below thepiston will be that developed by the pump to force the oil through thefilter. The condition of the filter in either case will regulate theposition of the piston and the position of the piston will be indicatedby the pointer 38 and scale 39.

I claim:

[1. In combination with a submerged oil filter, a fitting, said fittingconsisting of a body provided with an inlet for attachment to the outletof the filter and with an oil oulet, means for circulating oil throughthe filter and said body, said body being provided with a bore openingto the bottom of said body, and having an annular piston slid-ablyfitting said bore, a valve member fitted into the central opening insaid piston, said valve member consisting of a core having a valve discfitting into and normally located in and closing said opening, said corebeing also provided with a plurality of ribs extending above said disc.spring means normally maintaining said piston in a position in whichsaid disc blocks said opening but yielding to allow said piston to moveto a position wherein said opening is unblocked, and means actuated bysaid piston and visible outside of said body indicating the actualposition of said piston] [2. In combination with a submerged oil filter,a fitting, said fitting consisting of a body provided with an inlet forattachment to the outlet of the filter and with an oil outlet, means forcirculating oil through the filter and said body, said body beingprovided with a bore opening to the bottom of said body, a piston insaid bore and having one face exposed to the submerging oil, said pistonbeing actuable by the pressure difference within and without said body,a shoulder on said piston, a lever having its free end resting on saidshoulder and fixed to a shaft extending through and having a bearing ina wall of said body and an indicator hand fixed to the outer end of saidshaft to indicate the position of said lever and thereby of said piston][3. In combination with a submerged oil filter, a fitting having aninlet connected to the outlet of said filter, and an outlet forconnection with oil circulating means, a chamber in said fitting open tosaid inlet and outlet and to the Outside of the fitting, a pistonslidably mounted in said chamber and exposed to the submerging oil,valve means operatively associated with said piston whereby said valvemeans is opened and closed by movement of said piston, and meansindicating the position of said piston, said indicating means beingactuated by said piston] [4. The combination of an oil filter and afitting, said fitting comprising a body having a chamber, means forconducting oil from the oil filter to said chamber, and means forconducting oil from said chamber to the point of use, said chamber beingprovided with a movable wall, subjected on one side to pressureconditions in said chamber, means for subjecting the other side of saidwall to pressure conditions existing in the oil entering said filter,and means actuated by and indicating the position of said wall resultingfrom a difference in said pressure conditions] [5. The combination of anoil filter and a fitting, said fitting comprising a body having achamber, means for conducting oil from the oil filter to said chamber,and means for conducting oil from said chamber to the point of use, apiston constituting at least a portion of one wall of said chamber andsubjected on one face to pressure conditions in said chamber, means forsubjecting the other face of said piston to pressure conditions existingin the oil entering said filter, and means actuated by and indicatingthe position of said wall resulting from a dilference in said pressureconditions] 6. A fitting in combination with a liquid filter formed withmeans open to a source of liquid and formed with an outlet port,including means for nornmlly circulating liquid from said source throughthe filter to the out/ct port and therefrom through the filing to aliquid user, .s'uid fitting comprising.

(a) at body structure formed with a bore having one end adapted tocommunicate with said source of liquid, an inlet and an outlet formed insaid body and connected with an interior portion of said bore, saidinlet connected with the filler outlet port and said outlet connectedwith said liquid uscr,

( b) a piston slideable in said bore and movable in response to changesin diflcrcntial bctwccn liquid pressure of the source and in theinterior portion of mid bore as said filter becomes progressivelyclogged with foreign matter, and valve means supported by said bodystructure within said bore, said piston and said valve means cooperatingto ClOSn communication between the interior portion of said bore andsaid source of liquid during a predetermined movemcnt of said piston asthe filler becomes progressively clogged and to open commnnit'ution utthrlimit of mid predetermined movement to Irv-puss liquid from thesource through said bore to the outlet of suid fitting,

(c) spring means within said borc urging said piston toward a positionin which communication between the interior portion of the bore and saidsource of liquid is closed,

(d) an arm element rotarably carried by said body structure within saidbore and opcrativcly engaged with said piston to be rotated by movementthereof, an indicator clement roralably carried by and 0xtcriorly ofsaid body structure and operative/y connected with said urm element tobc rotated thcrcby us said piston moves to indicate on (H! urcuatc.s'culc mounted on the exterior of said body structure the progressivelyclogged condition of said filter as reflcctcd by piston movement.

7. The combination as defined in claim 6 wherein said filter issubmerged in the liquid of the source and said circulating meanscomprises means generating suction at the outlet of said fitting to drawliquid normally through said filter and on by-passing to draw liquidfrom the source directly imo said bore and out said filling outlet.

8. The combination as defined in claim 6 wherein said circulating meanscomprises means to direct liquid under pressure from the source normallythrough said filter and on by-passing to direct liquid under pressurefrom the source directly into said bore and out said fitting outlet.

9. The combination as defined in claim 6 wherein said arm and indicatorelements are secured to opposite ends of a shaft rotatably bearinglycarried by said body and extending through a side wall thereof into theinterior portion of said bore for rotation on the shaft axis by movementof said piston rotating said arm element.

10. The combination as defined in claim 6 wherein said piston has apassageway extending axially therethrough and said valve means comprisesa core member extending into said passageway and having a valve diskrelatively slidcably fitting therein, and means immovably supportingsaid core member by said body structure.

11. The combination as defined in claim 10 wherein said passageway isaligned concentric with said bore, and said core is concentricallypositioned within said bore and within said passageway, said meanssupporting said core comprising longitudinal ribs extending radiallyfrom said core to slidcably fit said passageway and are formed at thecud of said core disposed in the interior portion 5 6 of said bare toabut the body structure for support of 2,217,056 10/1940 Johnson 137-526said core. 2,308,583 1/1943 Barges 137-526 12. The combination asdefined in claim 11 wherein 2,400,200 5/1946 Katcher 210-411 XR saidspring means comprises a coil spring surrounding 2,499,494 3/1950 Greer210-62 said core and portions of said ribs, said spring extending 52,523,967 9/1950 Nystul 200-83 between and abutting the piston and aportion of said 2,567,430 9/1951 Griffiths 116-124 ribs disposed in theinterior portion of said bore. 2,678,134 5/1954 Middleton 210-1312,700,362 1/1955 Calling 116-117 Refemcef 2,776,056 1/1957 Douglas210-166 The following references cited by the Examiner, are 10 3 077 2 73 19 3 Rowen 31 9 of record in the patented file of this patent or theoriginal Patent LOUIS J. CAPOZI, Primary Examiner UNITED STATES PATENTSUS. Cl XIR. 2,669,707 2/1954 Ehrman. 21[) 9() 2,843,077 7/1958 Leefer.15

